v0.3.0 — entitlements catalog in PublicPoliciesResponse

Mirrors keysat 0014 + TS SDK 0.3.0. PublicPoliciesProduct gains
entitlements_catalog: Vec<EntitlementDef> with {slug, name,
description}. SDK consumers' in-app tier pickers can render display
names + tooltip descriptions instead of raw slugs. Empty vec on
legacy products without a catalog. No breaking change.

src/lib.rs

@@ -47,6 +47,7 @@ pub use verify::{Verifier, VerifyOk};
 
 #[cfg(feature = "online")]
 pub use online::{
-    Client, MachineResponse, PollResponse, PublicPoliciesProduct, PublicPoliciesResponse,
-    PublicPolicy, PurchaseSession, StartPurchaseOptions, ValidateRequest, ValidateResponse,
+    Client, EntitlementDef, MachineResponse, PollResponse, PublicPoliciesProduct,
+    PublicPoliciesResponse, PublicPolicy, PurchaseSession, StartPurchaseOptions,
+    ValidateRequest, ValidateResponse,
 };